Conical roof - how to

carheir · 26 Mar 2012, 19:05

Can anyone give me assistance on how to make a conical roof image with segmented staves such that I could figure out what size each piece would be and the angle each stave should be cut to in order to make the structure. I am looking at the bottom diameter to be 20" x 12" tall with a 3.5" opening at the top. The opening will be filled with a turned finial. Any help would be greatly appreciated.

Thanks,
Mike

Dave R · 26 Mar 2012, 19:53

It's pretty easy to do. How many staves do you want to use?

TIG · 26 Mar 2012, 20:00

As Dave says, it's no so complicated...

To make a cone... make a circle with the required number of segments... Draw a triangle representing the sloping part and use FollowMe on it around the circle's path.
Select all and 'Smooth' at 0 so no edges are invisible.
Erase unwanted bits.
Make a 'spar' [stave?] along one of the sloping edges.
Save it as a component.
Use Rotate+Ctrl to make a circular array of the components around circle so you have a #spar' at each node.
Edit one instance of it so it 'marries' with its siblings [which change as you edit].
If you want a 'wedge' of roof instead/as-well... make that and do the copies around instead/as-well.
Make the 'finial' using a vertically drawn cross-section and FollowMe around the circular path...

Dave R · 26 Mar 2012, 20:09

While TIG was typing I made an example using 8 staves.

I used the Polygon tool to make an octagon for the top and bottom dimensions. Then I used Auto-fold to pull the small one up to make the "cone". Next I split out a single stave from the cone by using Offset for the top and bottom and radials from outside corners to inside corners. The rest was deleted. Then I made a component of the stave and used one of them to sort out the angle.

Staves.skp

carheir · 26 Mar 2012, 20:16

Thanks guys, let me kinda digest what you have suggested and see if I can replicate it. I have not used the "auto-fold" tool yet. Where in the tool bag is it?

gilles · 26 Mar 2012, 20:31

autofold is a feature of the move tool press ctrl on pc cmd on mac to activate.

OOps! it seem to be alt on pc

gilles · 26 Mar 2012, 20:39

to be seen.

Dave R · 26 Mar 2012, 20:51

Sorry. I didn't know I was introducing you to something new. Thanks to Gilles for the clarification.

carheir · 26 Mar 2012, 21:02

Ok, here is my base model. So how do I get the cone to evolve from here?

cone base.skp

Dave R · 26 Mar 2012, 21:08

Check you PMs. I just sent you one.

carheir · 26 Mar 2012, 21:09

Figured out how to raise the roof so to speak. Now to break out one of the staves. Thanks again.

Mike

TIG · 26 Mar 2012, 21:34

Something like this ?

brookefox · 27 Mar 2012, 05:47

I'd like to climb up on this heap o' help to offer something, but I can't or won't and am ill equipped, anyway. You guys are so nice.

Drivel I can do.

Dave R · 27 Mar 2012, 10:13

Like this. And it's all sorted.

pilou · 27 Mar 2012, 10:27

Why as the first post there is not a hand sketching introduced ?
Text is not sufficient and not speedy as a simple image

TIG · 27 Mar 2012, 10:32

A picture paints a thousand words...
but
A word paints a thousand pictures...

pilou · 27 Mar 2012, 10:48

@unknownuser said:

A word paints a thousand pictures...

If you know read!

Dave R · 27 Mar 2012, 11:06

@unknownuser said:

Why as the first post there is not a hand sketching introduced ?
Text is not sufficient and not speedy as a simple image

You're right. A simple image can explain more easily than many words. Still, it's pretty common that first time posters don't post images. The important thing is the OP got the help he needed.